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Regioselective ruthenium(0) catalyzed [4+2] cycloaddition of 3,4-benzannulated 1,5-diynes with α-ketols and general catalytic mechanism.a
aYields are of material isolated by silica gel chromatography. RuPhos = 2-dicyclohexylphosphino-2′,6′-diisopropoxybiphenyl.
